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nvme-pci: use appropriate initial chunk size for HMB allocation 

The initial chunk size for host memory buffer allocation is currently
PAGE_SIZE << MAX_ORDER.  MAX_ORDER order allocation is usually failed
without CONFIG_DMA_CMA.  So the HMB allocation is retried with chunk size
PAGE_SIZE << (MAX_ORDER - 1) in general, but there is no problem if the
retry allocation works correctly.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
[hch: rebased]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Cc: stable@vger.kernel.org
hifive-unleashed-5.1
Akinobu Mita 2017-09-06 12:15:31 +02:00 committed by Christoph Hellwig
parent 92dc689563
commit 30f92d62e5
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/pci.c
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@ -1680,7 +1680,7 @@ static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
u32 chunk_size;
/* start big and work our way down */
for (chunk_size = min_t(u64, preferred, PAGE_SIZE << MAX_ORDER);
for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES);
chunk_size >= PAGE_SIZE * 2;
chunk_size /= 2) {
if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) {